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[[File:Linux API and Linux ABI.svg|thumb|300px|The [[Linux kernel]] and [[GNU C Library]] define the [[Linux kernel interfaces#Kernel–user space API|Linux API]]. After compilation, the binaries offer an ABI. Keeping this ABI stable over a long time is important for [[Independent software vendor|ISVs]].]]
An '''application binary interface''' ('''ABI''') is an [[interface (computing)|interface]] exposed by [[software]] that is defined for in-[[Process (computing)|process]] [[machine code]] access. Often, the exposing software is a [[Library (computing)|library]], and the consumer is a [[computer program|program]].
An ABI is at a relatively low-level of [[abstraction (computer science)|abstraction]]. Interface compatibility depends on the target [[computer hardware|hardware]] and the [[software build]] [[toolchain]]. In contrast, an [[application programming interface]] (API) defines access in [[source code]] which is a relatively high-level, hardware-independent, and [[human-readable]] format. An API defines interface at the source code level, before compilation, whereas an ABI defines an interface to compiled code.
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